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Full text of "Metallurgy Of Cast Iron"

464.
METALLURGY   OF   CAST   IRON.
bars are less dense and present more of a dark gray color than the one-inch square bars. The turned bars show a fine, rich-colored, compact iron, such as would stand exceptional wear and resistance to fracture. Bar No. 34 pulled 26,160 pounds, and No. 35, 28,676 pounds. For medium to heavy machinery, this metal should make a most serviceable casting.
TABLE 93.—TRANSVERSE TESTS OF LIGHT MACHINERY IRON.
M <L» H 6 £	Common rule measurement.	Microm't'r measurement.	Deflection.	Broke at in pounds.	Strength per square inch in pounds.
41	Rough bar. % in. square .........	.499 in.	.200 in.	454	!.823   3,632
42 43	Rough bars, i in. square ...........	.016 in. .021 "	.130 in. .125   '	1,710 . 1,760	1,657  ...... i ,688
44	"          "       ........	.008 "	.115   '	i, 800	i,77i    - - .
45 46 47	Rough bars. i^4 in. diam ........	.146 in. .156 " .141	.160  n. .180   ' .180   '	i,795 2,220 1,980	i,74i    .  - • 2,115   .  - • i,938   .  . .
1^	Turned bars. il/z in. diam ........	1.162 in.	.200  n.	1)7°5	i 609
49		i 160 "	.210   '	i 720	i 628
CQ	«         «	I 17^ "	210    '	1 77s*	I 6^7
I					
Test bars furnished by Taylor, Wilson & Co , L,td., Allegheny, Pa. Tested by J. B Nau, at the works of McConway & Torley, Tune i9th, 1894. Witness, R. G. G. Moldenke, E. M., Ph. D.
The fracture of above set of tests shows an exceptionally good iron for light work. The tests record above the average for soft iron as regards strength. The color is a rich gray, devoid of that silver look many castings display that are desired to be of a soft quality. The half-inch bars are the closest grained, the one-inch square the next in order, then comes the one and one-eighth inch in the rough, followed by the turned one and one-eighth inch bars, which are the . most open-grained, rich in color and graphite. A few of these bars were pulled for the tensile strength.hat recording the strongest mixture, seen in Table 89; the